USPTO Patents Application 10621505

In the Claims :

Please amend claims 1 and 14 as follows:

1 . (Currently amended) A liquid crystal display device comprising
two substrates sandwiching a liquid crystal having spontaneous polarization, and electrodes
for applying a voltage to said liquid crystal,

wherein said liquid crystal shows a monostable state in which an average
molecular axis of a director of liquid crystal molecules is aligned in a single direction and
present in a first position when no voltage is applied, shows a state in which the average
molecular axis is tilted in one direction from the first position at an angle corresponding to a
magnitude of a voltage of a first polarity and present in a second position when the vohage of
the first polarity is applied, and shows either a state in which the average molecular axis
maintains the first position or a state in which the average molecular axis is tilted in a
direction opposite to said one direction from the first position and present in a third position
when a voltage of a second polarity opposite to the voltage of the first polarity is applied, and

a temperature range of either one of a cholesteric phase and a chiral nematic
phase of a phase sequence of said liquid crystal, the phase sequence being either one of an
isotropic phase - cholesteric phase - chiral smectic C phase and an isotropic phase - chiral
nematic phase - chiral smetic C phase from a higher-temperature side, has a temperature
width of not less than 3°C^

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wherein an alignment treatment is performed to bring said liquid crystal into
the monostable state by cooling said liquid crystal at a rate of 3 to 10 °C/minute and by
providing a period in which the temperature of said liquid crystal is kept within a temperature
range showing either one of the cholosteric phase and the chiral nematic phase during
cooling, after heating said liquid crystal to a temperature of the isotropic phase thereof

2. (Original) The liquid crystal display device of claim 1,
wherein the temperature range of either one of the cholesteric phase and the

chiral nematic phase of the phase sequence of said liquid crystal has a temperature width of
not less than 5°C.

3. (Original) The liquid crystal display device of claim 1,
wherein said liquid crystal is a ferroelectric liquid crystal.

4. (Original) The liquid crystal display device of claim 2,
wherein the temperature range of either one of the cholesteric phase and the

chiral nematic phase of the phase sequence of said liquid crystal has a temperature width of
not less than 10°C.

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5. (Original) The liquid crystal display device of claim 2,
wherein said liquid crystal is a ferroelectric liquid crystal.

6. (Original) The liquid crystal display device of claim 4,
wherein said liquid crystal is a ferroelectric liquid crystal.

7. (Original) The liquid crystal display device of claim 1, further
comprising a back-light which is driven by a field-sequential color scheme,

wherein a data- writing scanning voltage and a data-erasure scanning voltage
are applied to said electrodes.

8-13. (Cancelled)

1 4. (Currently amended) A manufacturing method of a liquid crystal
display device comprising two substrates sandwiching a liquid crystal having spontaneous
polarization, and electrodes for applying a voltage to said liquid crystal, wherein said liquid
crystal shows a monostable state in which an average molecular axis of a director of liquid
crystal molecules is aligned in a single direction and present in a first position when no
voltage is applied, shows a state in which the average molecular axis is tilted in one direction
from the first position at an angle corresponding to a magnitude of a vohage of a first polarity

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and present in a second position when the voltage of the first polarity is applied, and shows
either a state in which the average molecular axis maintains the first position or a state in
which the average molecular axis is tilted in a direction opposite to said one direction from
the first position and present in a third position when a voltage of a second polarity opposite
to the voltage of the first polarity is applied, and a temperature range of either one of a
cholesteric phase and a chiral nematic phase of a phase sequence of said liquid crystal, the
phase sequence being either one of an isotropic phase - cholesteric phase - chiral smectic C
phase and an isotropic phase - chiral nematic phase - chiral smetic C phase from a higher-
temperature side, has a temperature width of not less than 3^C, said manufacturing method
comprising the steps of:

introducing said liquid crystal between said two substrates;

performing an alignment treatment to bring said liquid crystal into the •
monostable state by cooling said liquid crystal at a rate of 3 to 10 °C/minute and b y providing
a period in which the temperature of said liquid crystal during cooling is kept within a
temperature range showing either one of the cholesteric phase during cooling , after heating
said liquid crystal to a temperature of the isotropic phase thereof

15. (Original) The manufacturing method of a liquid crystal display
device of claim 14,

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wherein the alignment treatment is performed after heating said Hquid crystal to
an isotropic phase.

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